How the test works
Your browser makes two requests: one to a server reachable only over IPv4 and one to a server reachable only over IPv6. If a request succeeds, that protocol works end to end on your connection.
If both requests fail, the check service itself was probably blocked, so the result is reported as “not determined” rather than claiming you have no internet protocol support.
What the result means
- Dual stack (both) — ideal. Your devices can reach every site.
- IPv4 only — still the most common setup. Everything works; you just don't benefit from IPv6.
- IPv6 only — common on some mobile networks, which translate to IPv4 (NAT64) behind the scenes.
How to enable IPv6
- Ask your ISP whether IPv6 is offered on your plan.
- In your router's admin page (router login), look for an IPv6 or “WAN IPv6” setting and choose the mode your ISP recommends (often DHCPv6 or PPPoE with IPv6).
- Restart the router and run this test again.
Questions
Is IPv6 faster than IPv4?
Not inherently. Sometimes IPv6 avoids carrier-grade NAT and can have a slightly shorter path, but speed mostly depends on your plan and network conditions.
Do I need IPv6?
Not today — nearly everything is reachable over IPv4. IPv6 becomes useful for hosting services at home when your ISP uses carrier-grade NAT for IPv4.